Articles by Keyword: Gill Nets

Search results for Gill Nets

We found 23 results for you
  1. ASPECTS OF THE FISHERIES OF LAKE LIAMBEZI, CAPRIVI

    ASPECTS OF THE FISHERIES OF LAKE LIAMBEZI, CAPRIVI

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Lake Liambezi, situated in the Linyanti Swamp, Caprivi, is inhabited by 43 fish species. Population estimates with seine nets, rotenone and explosives gave values of 74 to 157 kg ha−1. The composition of seine net catches differed markedly from gill...
  2. POST-IMPOUNDMENT TRENDS IN THE FISH POPULATIONS OF THE HENDRIK VERWOERD DAM, SOUTH AFRICA

    POST-IMPOUNDMENT TRENDS IN THE FISH POPULATIONS OF THE HENDRIK VERWOERD DAM, SOUTH AFRICA

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Fish population changes in the Hendrik Verwoerd Dam are presented as sampled with a series of multifilament gill nets from Spring 1971 to Summer 1977. During this period, species such as Barbus halubi (smallmouth yellowfish), B. kimberleyensis (largemouth yellowfish), Labeo...
  3. Sharks caught in the protective gill nets off KwaZulu-Natal, South Africa. 11. The scalloped hammerhead shark <em>Sphyrna lewini</em> (Griffith and Smith)

    Sharks caught in the protective gill nets off KwaZulu-Natal, South Africa. 11. The scalloped hammerhead shark <em>Sphyrna lewini</em> (Griffith and Smith)

    Item type: Journal Article • Journal: African Journal of Marine Science
    Between 1978 and 1998, a total of 3 385 scalloped hammerhead sharks Sphyrna lewini was caught in the protective nets off KwaZulu-Natal. The mean annual catch was 166 sharks (range 60–279). There was a significant decrease in catch rate with...
  4. Sharks caught in the protective gill nets off KwaZulu-Natal, South Africa. 12. The African angel shark <em>Squatina africana</em> (Regan)

    Sharks caught in the protective gill nets off KwaZulu-Natal, South Africa. 12. The African angel shark <em>Squatina africana</em> (Regan)

    Item type: Journal Article • Journal: African Journal of Marine Science
    Between 1980 and 2001, a total of 661 African angel sharks Squatina africana was caught in the protective nets off KwaZulu-Natal, South Africa. The mean annual catch was 30 sharks (range = 11–69, SD = 12.4), with no trend in...
  5. RELATIVE FISH POPULATION DENSITY CHANGES IN THE P.K. LE ROUX DAM DURING THE FIRST THREE YEARS AFTER INUNDATION

    RELATIVE FISH POPULATION DENSITY CHANGES IN THE P.K. LE ROUX DAM DURING THE FIRST THREE YEARS AFTER INUNDATION

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Before inundation in September 1976 Barbus holubi and Labeo capensis were the dominant species each making up 46% of the total catch. Immediately after impoundment the relative density of B. holubi increased to 75% while that of L. capensis dropped...
  6. Aerial and Aquatic Respiration in the River Crab <em>Potamonautes Warreni</em> Calman with Notes on Gill Structure

    Aerial and Aquatic Respiration in the River Crab <em>Potamonautes Warreni</em> Calman with Notes on Gill Structure

    Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences
    The oxygen consumption rate (ṀO2) for Potamonauteus warreni Calman (= Potamon warreni (Calman) kept in 25 °C water was 34,4 μmol 1−1 O2 kg−1 and after 72 hours in 98% R.H. air the rate was 31,9 μmol 1−1 O2 kg−1...
  7. Sublethal effects of manganese on the haematology and osmoregulation of <em>Oreochromis mossambicus</em> after acute exposure

    Sublethal effects of manganese on the haematology and osmoregulation of <em>Oreochromis mossambicus</em> after acute exposure

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Oreochromis mossambicus were exposed for 96 hours to sublethal manganese concentrations in a continuous flow-through system. The sublethal concentrations were determined from the LC50 value of manganese (1.723mg/l), which included a 10% (172.3mg/l), 15% (259.8mg/l) and 20% (345.6mg/l) concentration of...
  8. Artisanal gill-net fishery catches of the catfish, <em>Schilbe intermedius</em> (Teleostei: Schilbeidae), in two tributaries of the Ouémé River, Bénin, West Africa

    Artisanal gill-net fishery catches of the catfish, <em>Schilbe intermedius</em> (Teleostei: Schilbeidae), in two tributaries of the Ouémé River, Bénin, West Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Artisanal fishery gill-net catches of the catfish Schilbe intermedius were studied in the Okpara and Zou tributaries of the Ouémé River, Benin in 1999 and 2000. The largest fish caught at the Toué and Kpassa stations measured 26.2cm and 24.5cm...
  9. Towards the development of a macroinvertebrate sampling technique for palustrine wetlands in South Africa: a pilot investigation in the KwaZuluNatal midlands

    Towards the development of a macroinvertebrate sampling technique for palustrine wetlands in South Africa: a pilot investigation in the KwaZuluNatal midlands

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    A study was undertaken in November 2003 to derive a suitable sampling technique for collecting a representative sample of aquatic macroinvertebrates from a selected emergent vegetation biotope in a palustrine wetland, Melmoth Vlei, KwaZulu-Natal, South Africa. The aim was to...